<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Netty WebSocket时间服务器</title>
</head>
<body>
<br>
<script type="text/javascript">
  var socket;
  if (!window.WebSocket) {
    window.WebSocket = window.MozWebSocket;
  }

  if (window.WebSocket) {
    socket = new WebSocket("ws://localhost:8080/websocket");
    socket.onmessage = function (ev) {
      var ta = document.getElementById("responseText");
      ta.value = "";
      ta.value = ev.data;
    };

    socket.onopen = function (ev) {
      var ta = document.getElementById("responseText");
      ta.value = "打开WebSocket服务正常，浏览器支持WebSocket！";
    };

    socket.onclose = function (ev) {
      var ta = document.getElementById("responseText");
      ta.value = "";
      ta.value = "WebSocket关闭！";
    };
  } else {
    alert("抱歉，您的浏览器不支持WebSocket协议！")
  }

  function send(message) {
    if (!window.WebSocket) {
      return;
    }

    if (socket.readyState == WebSocket.OPEN) {
      socket.send(message);
    } else {
      alert("WebSocket连接没有建立成功！")
    }
  }
</script>

<form onsubmit="return false;">
  <input type="text" name="message" value="Netty最佳实践"/>
  <br><br>
  <input type="button" value="发送WebSocket请求消息" onclick="send(this.form.message.value)"/>
  <br color="blue"/>
  <h3>服务端返回的应答消息</h3>
  <textarea id="responseText" style="width: 500px;height: 300px;"></textarea>
</form>
</body>
</html>